Email Software Resources

The Chinese characters which I inserted in the questions will change sometimes? Any reasons? Is it due to bugs or something else?

How to add a Gmail account in outlook 2016?

In my inbox, new emails are automatically sorted into categories labeled important and other. How do I keep emails from automatically being sorted this way? I find myself having to navigate between the two to make sure I don't miss anything, and it seems it would be easier if everything came into the same place.